Consider a jar of 9 chocolate chip and 11 peanut butter cookies. You randomly select 2 cookies to eat. All possible choices are equally likely.
a. What is the probability that the 2 you select will both will be chocolate chip?
b. What is the probability that at least one of your cookies will be peanut butter?
c. What is the probability that last 2 cookies left in the jar (after 18 have been eaten) will be chocolate chip? (Is this answer the same or different than part a? Why or why not?)